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Fig. 3.1 (A) Delay analysis. (i) Receptive fields for delay (x-axis, one frame is 0.28 s) and angle (y-axis) for example pixel in pretectum (left) and tectal neuropil (right). Notice weight is smeared in x-axis for tectal neuropil. (ii) distribution of preferred delay weight in the pretectum (left) and the tectal neuropil (right) for prey-experienced (top, blue, N = 23) and prey-naïve (bottom, red, N = 17) fish are very similar. (B) The mean and standard deviation of the preferred angle distributions were indistinguishable between prey-experienced and prey-naïve fish. (preferred angle p = 0.93 left pretectum, p = 0.31 right pretectum, p = 0.91 left tectal neuropil, p = 0.68 right tectal neuropil. Standard deviation p = 0.96 left pretectum, p = 0.34 right pretectum, p = 0.42 left tectal neuropil, p = 0.21 right tectal neuropil) (C) Average event frequency in left and right pretectums was not different between prey-experienced and prey-naïve fish in either evoked (p = 0.20, left) or spontaneous (p = 0.56, second from left) conditions. Average pretectum event amplitude was not different between prey-experienced and prey-naïve fish in evoked (p = 0.54, second from right) or spontaneous (p = 0.67, right) conditions. A permutation test was used for all pairwise comparisons if not specified otherwise (see Materials and methods, Behavioral data analysis and statistics). Data tables for all panels in Figure 3—figure supplement 1—source data 1.